The couple said Karson will live in their Spokane County home for about four months before moving to the 12,000-acre Schreiner Farms ranch, which John Schreiner co-owns with his brother Joe.
"He may be the only giraffe ever to be raised as a pet in Spokane," John Schreiner said.
The ranch already houses three adult giraffes, in addition to zebras, bison and camels.
The couple said they do not believe local officials will have any objection to Karson staying in their home while he grows.
"He's not a carnivore, which is the one concern the county and states are right to control people from raising," John Schreiner said. "I can't see any reason we can't keep him. He's intelligent, gentle and a wonderful creature," he said.